R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
2.3.11 AM Modulation Frequency and Modulation Factor of AM Signals
2-118
7.
Press LEVEL, 5 and GHz(+dBm).
The reference level is set to +5 dBm.
8.
Press SRCH.
The normal marker is displayed on the trace peak.
9.
Press MKR and Delta Marker.
The delta marker is displayed.
10. Press SRCH and Next Peak.
The normal marker moves to the next highest peak.
Figure 2-133 AM Signal with Low Modulation Factor
Calculating modulation frequency
11. Read the delta marker’s frequency.
This value is the modulation frequency.
Calculating the modulation factor
12. Read the delta marker’s level.
Modulation factor m is calculated from the following formula, using
∆
Level as
the delta marker’s level.
Approximate values are shown in Figure 2-134.
m = 10
∆
Level + 6
20